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Creating a Lens Flare with alpha ON TOP of another image -> Premiere
Hi –
I know this question has been posted in various forms, but none with this combo – Basically, I’m trying to create a lens flare on top of an image, rendering the whole thing from AFX with an alpha channel, and plopping it on a sequence in Premiere (without changing the layer mode to screen in Premiere – which, I don’t think you can do in Premiere??)
In any case, I’m trying to make it “dummy proof” for the editor, so they can just import the QT into premiere, and voila! there’s a lens flare over the image, and an alpha channel already there.
So far, in After Effects, I’ve pre-comped the lens flare with a black solid, and changed the solid’s mode to screen, but when I render this with an alpha, I still get the black BG when I bring it in Premiere.
Any help would be greatly appreciated! (AND, a step-by-step would be TOTALLY appreciated!)
Thank you in advance,
Jennifer -
6 Replies
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Wouldn’t it be best to also render the movie as “straight-unmatted” to get rid of dark halos on transparent areas? I usually do that when I output a ProRes 4444 that I’m going to key elsewhere…
Greg Leslie
Broken Arrow, OK -
[Jennifer Jones] “Basically, I’m trying to create a lens flare on top of an image, rendering the whole thing from AFX with an alpha channel, and plopping it on a sequence in Premiere (without changing the layer mode to screen in Premiere – which, I don’t think you can do in Premiere??) “
Premiere has blend modes. They’re located in the Opacity twirl-down of the Effects Control panel [image]:
It just takes a couple clicks to set it, and you’ll get a much nicer composite.
Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog – What I’m thinking when my workstation’s thinking
Creative Cow Forum Host: Live & Stage Events -
With the lens flare on a black solid apply the channel>shift channels effect and set the alpha to luminance. Then apply the channel > remove color matting effect. That should do it.
Correct interpretation of the alpha in your NLE will be important.
Also: premiere does have blend modes.
Darby Edelen
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Ah thank you all! Sounds like it’s best to use the (newly discovered)
Premiere screen mode.. will give it a shot tomorrow. Thanks again! -
if you wanted to key it, i’d modify darby’s recipe slightly and use the channel combiner effect, setting ‘from’ to max rgb and ‘to’ to alpha, then add the remove color matting effect.
this will keep all the color saturation (using shift channels will lose some of it).
or, download unmult (free from red giant) which does all that in one step.
Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW -
[Kevin Camp] “if you wanted to key it, i’d modify darby’s recipe slightly and use the channel combiner effect, setting ‘from’ to max rgb and ‘to’ to alpha, then add the remove color matting effect.
this will keep all the color saturation (using shift channels will lose some of it).”
Good point. I always work in 32 bits per channel where that doesn’t happen 🙂
Darby Edelen
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